New correlation for heat transfer during subcooled boiling in plain channels and annuli

A new correlation for predicting heat transfer in plain channels and annuli is presented. It has been verified with data for 13 diverse fluids (water, refrigerants, chemicals) in single and multi channels as well as annuli over a very wide range of test data. These include hydraulic diameters from 0.176 to 22.8 mm, annular gaps 0.5-11.4 mm, reduced pressures from 0.0046 to 0.922, mass flux from 59 to 31500 kg m−2 s−1 and subcooling from 0 to 165 °C. It was verified with 1340 data points from 68 data sets from 37 sources. The mean absolute deviation was 12.2%. The same database was also compared to other available correlations but their deviations were significantly greater.